Lecture 28: Contraction Flashcards
What is the function of cardiac muscle?
- Pumping of blood around the body
What is the function of smooth muscle?
- to control the movement of fluids
- movement in walls of hollow organs
What is the function of skeletal muscle?
- Heat
- Posture
- Movement
What is the type of control for:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal = voluntary
Cardiac & Smooth = involuntary
Are there synapses in:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal = synapses
Cardiac & Smooth = no discrete syanpses
Are there striations in:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal muscle = striations
Cardiac muscle = striations
Smooth muscle = NO striations
Are there T-tubules in:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal & cardiac muscle = T-tubules
Smooth muscle = NO tubules
Are there gap junction in:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal muscle = NO gap junctions
Cardiac muscle = GAP junctions - intercalated discs connect cells ----> heart contracts in unison ---> heartbeat
Smooth muscle
- Single unit = GAP junctions
- Multi uint = NO gap junctionsWhat is the contraction speed for:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal muscle = Fast
Cardiac muscle = Slow - continuous all at once - PACEMAKER
Smooth = Very slow - due to no t-tubules
Is there autonomic input for:
- Skeletal muscle
- Cardiac muscle
- Smooth muscle
Skeletal muscle = NO
Cardiac & smooth = YES
What is the cell structure of:
- Skeletal muscle cells
- Cardiac muscle cells
- Smooth muscle cells
Skeletal = multinucleate long cylindrical cells Cardiac = mononucleate branching cells Smooth = mononucleate spindle like cells
Heat can be lost through:
= through the skin via - radiation, evaporation, conduction or convection
= blood vessels close to the skin
= sweating
How does skeletal muscle increase body temp?
- Shivering
- voluntary movement in the form of exercise
How does smooth muscle increase body temp?
- Vasoconstriciton = decrease in diameter of blood vessels flow —-> reduces amount of blood flow
- –> reduces heat loss through skin - diverts blood flow from perphiphery to core
- Piloerection = haris stand up on end to trap more heat
How does smooth muscle decrease body temp?
Vasodilation = increase in diameter of blood vessels
——-> blood flow is diverted to skin
How does cardiac muscle decrease body temp?
Contracts more forcefully to drive blood through dilated blood vessels —–> maximum heat loss
How do sweat gland decrease body temp?
secretion of sweat - which then evaporates from skin and cools you down
When your core body temp is high …….
blood vessels dilate
sweat glands sweat
When core body temp is low ……..
blood vessels constrict
muscles shiver
